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Differences What are the advantages of each

Front view of Intel Xeon L5639

Reasons to consider the
Intel Xeon L5639

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Much lower typical power consumption 48.75W vs 176.72W 3.6x lower typical power consumption
Much better performance per dollar 2.23 pt/$ vs 1 pt/$ Around 2.2x better performance per dollar
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Much better performance per watt 11.16 pt/W vs 5.04 pt/W Around 2.2x better performance per watt
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Much lower annual home energy cost 14.45 $/year vs 56.39 $/year 3.9x lower annual home energy cost
Much lower annual commercial energy cost 52.56 $/year vs 184.84 $/year 3.5x lower annual commercial energy cost
Front view of Intel Core i7 3960X

Reasons to consider the
Intel Core i7 3960X

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Significantly higher clock speed 3.3 GHz vs 2.13 GHz Around 55% higher clock speed
Significantly better PassMark (Single core) score 2,015 vs 1,125 Around 80% better PassMark (Single core) score
More l3 cache 15 MB vs 12 MB 25% more l3 cache; more data can be stored in the l3 cache for quick access later
Significantly better PassMark score 12,802 vs 7,021 More than 80% better PassMark score
Significantly better overclocked clock speed (Air) 4.76 GHz vs 3.46 GHz Around 40% better overclocked clock speed (Air)
More l3 cache per core 2.5 MB/core vs 2 MB/core 25% more l3 cache per core
Much better overclocked clock speed (Water) 4.58 GHz vs 2.13 GHz Around 2.2x better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon L5639 vs Core i7 3960X

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L5639
14,645
Core i7 3960X
18,528

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5639
1,390,000 MB/s
Core i7 3960X
2,595,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Xeon L5639
9,881
Core i7 3960X
19,457

GeekBench (64-bit) Data courtesy Primate Labs

Xeon L5639
13,956
Core i7 3960X
20,406

GeekBench

Xeon L5639
13,956
Core i7 3960X
23,155

PassMark Data courtesy Passmark

Xeon L5639
7,021
Core i7 3960X
12,802

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon L5639  vs
Core i7 3960X 
Clock speed 2.13 GHz 3.3 GHz
Cores Hexa core Hexa core
Socket type
LGA 1366
LGA 2011

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Architecture QPI DMI 2.0
Number of links 2 1
Transfer rate 5,860 MT/s 5,000 MT/s

details

Xeon L5639  vs
Core i7 3960X 
Threads 12 12
L2 cache 2 MB 2 MB
L2 cache per core 0.33 MB/core 0.33 MB/core
L3 cache 12 MB 15 MB
L3 cache per core 2 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 3.46 GHz 4.76 GHz
Overclocked clock speed (Water) 2.13 GHz 4.58 GHz
Overclocked clock speed (Air) 3.46 GHz 4.76 GHz

power consumption

TDP 60W 130W
Annual home energy cost 14.45 $/year 56.39 $/year
Annual commercial energy cost 52.56 $/year 184.84 $/year
Performance per watt 11.16 pt/W 5.04 pt/W
Typical power consumption 48.75W 176.72W
Intel Xeon L5639
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Intel Core i7 3960X
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